<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        img {
            position: absolute;
            top: 0px;
            left: 0px;
        }
    </style>
</head>

<body>
    <img src="images//banner1.jpg" alt="">
    <script>
        var pic = document.querySelector('img');
        document.addEventListener('mousemove', function(e) {
            // console.log(1);
            var x = e.pageX;
            var y = e.pageY;
            pic.style.left = (x - 350) + 'px';
            pic.style.top = (y - 200) + 'px';
        })
    </script>
</body>

</html>